Getting new tires again for the Riviera. Looking for opinions/fit issues. I'd like to get a little rake going on the car but I'm not sure if adjusting tire size is "cheating" Anyway, 225/75/R15's all around at this point. I was thinking of going 215/75 up front and 235/75 in the back. I have stock rally wheels. I guess my questions are as follows. How much of a difference can you go with on a street car before it looks silly? What will fit our rims/wheelwells? How small in the front? How big in the rear? Blackwall, whitewall or raised white letter?